Physics: Waves, Sound/Light, Electromagnetic Waves, Magnetism, Mains Electricity and the National Grid

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1 6.7 Describe the method to measure the speed of sound in air and the speed of ripples on the water surface 7.5 Link the properties of EM waves to their practical application (triple 7.6 Apply knowledge of reflection, refraction, transmission and absorption to EM waves (triple 7.10 Explain how radio a radio works using EM waves (triple 8.16 Explain reflection, refraction, absorption and transmission of sound waves at a boundary. (triple 8.5 Show how properties of a sound wave changes as it moves from one medium to another (refraction) (triple 8.8 Describe what a convex and concave lens is and the image that would be produced by them drawing ray diagrams to illustrate this (triple 1. Write a method which would allow you to measure the speed of sound in air and the speed of ripples on the surface of water. List all of the equipment you would need and how you would take your measurements. Explain how to make your results accurate. 2. Complete a mind map to show the uses of each type of EM wave. You must explain why each one has this use e.g. Radio waves have low energy therefore are safe to use for radio transmission. Include in your mind map the key words: refraction, transmission, absorption 3. Draw a labelled diagram to show how a radio wave transmits signals. 4. For each of the following, write a paragraph explaining what is happening to the light rays. You may draw a diagram to help you: refraction, reflection, absorption, transmission. 5. Complete the table to compare specular reflection and diffuse reflection: Type Similarities differences specular reflection diffuse reflection 6. Draw a labelled diagram to show how sound waves behave when they move from one medium to another during refraction. 7. For each diagram, describe what is happening to the light rays and what will happen to the image: a. Concave lens b. Convex lens 70%+ 8.9 Use the equation magnification = image height object height (triple 5.7 Interpret diagrams of electromagnetic devices in order to explain how they work (triple 1.1 Describe the motor effect and use this to explain how electric motors work (triple 1.2 Explain and apply Fleming s left hand rule (triple 1.3 Recall factors that affect the size of the force on a conductor (triple 8. Use the formula magnification = image height object height to calculate the magnification of the convex and concave lenses in question 9. Write a flow chart to show the steps involved in making an electric bell sound Use and rearrange the equation F = B I l (triple 7.3 Describe the structure of a transformer (triple 7.4 Use and rearrange the transformer equation (triple 7.5 Apply this equation to describe the efficiency of transformers and the purpose of step up and step down transformers (triple

2 7.6 Use the coil equation and relate this to power input and output (triple 7.7 Apply these equations to explain the advantages of transmitting energy at a high potential difference.

3 60% 6.5 Use and rearrange f = v λ 7.3 Explain how EM waves are generated and absorbed 7.4 Explain the hazardous effects of UV, X-rays and Gamma rays 8.2 Describe reflection of waves at a boundary (triple 8.3 Construct ray diagrams to show reflection (triple 8.10 Explain how colour of objects is determined (triple 8.11 Explain how colour filters work (triple 5.6 Describe how to make an electromagnet and how to increase its strength 1. Calculate the wave speed of a wave with a frequency of 100Hz and a wavelength of 2m. 2. Complete the table to show the hazards of EM waves. Wave Hazard Explanation radio waves microwaves infrared waves visible light ultraviolet light x-rays gamma rays 3. Draw a ray diagram to show how light reflects off a smooth surface using these key terms: reflected ray, incident ray, medium, normal, angle of incidence, angle of reflection, boundary. 4. Explain why a green object appears black if viewed through a red filter. 5. Write a method for making an electromagnet. Include a labelled diagram. 6. Which three things can we do to make the electromagnet stronger? 1.5 Explain how loudspeakers and headphones work (triple 1.6 Explain how potential difference/current can be induced in a circuit (the generator effect!) (triple 1.7 Recall factors that can affect the size of this effect (triple 1.8 Apply principals of the generator effect to: a dynamo, microphone, transformers (triple 6.6 Explain how the power of a circuit is related to potential difference, current and energy

4 6.4 Use and rearrange T = 1/f 8.1 Describe the properties of light and explain how light travels. (triple 8.12 Define transparent and translucent (triple 8.13 Explain what a sound wave is and how the ear detects them (triple 1. A fly flaps its wings back and forth 121 times each second. The period of the wing flapping is sec. 2. Complete the following description of light using these words: opaque, electromagnetic, transparent, translucent Visible light is a type of wave that can be seen by the human eye. It can be absorbed, or transmitted. All objects either allow light through ( ), do now allow light through them ( ) or scatter light rays so objects cannot be seen clearly through them ( ). 50% 8.17 Explain how waves can be used for detection and exploration of structures (ultrasound, seismic, echo sounding) (triple 5.5 Explain how compasses work 1.9 Draw and interpret graphs of potential difference generated in a coil against time (triple 5.1 Describe the properties of mains electricity in the UK (A.C., Frequency and Voltage) 3. Draw a labelled diagram of the human ear and write a paragraph explaining how sound waves are created by a violin and then travel to reach the ear drum. 4. Draw a mind map to describe and explain the uses of waves in the following: echo sounding, seismic wave detection, the structure of the Earth. 8. Complete the paragraph: A magnetic compass contains a small. The compass aligns with the magnetic field. This means that the needle will always point to magnetic. words: North, bar magnet, Earth s, needle 5.2 Explain the difference between direct and alternating potential difference 5.3 Describe the three core cables and the wires that they are made up of and the dangers of these 7.2 Explain the role of step up and step down transformers in the national grid and use this to explain why it is an efficient system for transferring energy

5 6.1 Describe what is meant by a wave 1. Give the definition of a wave and list three examples of where we would find waves. 7.1 Describe the components of the national grid 40% 6.1 Use and rearrange the P=IV equation (electrical power) 6.2 Use and rearrange the P=I2R equation (electrical power) 6.3 Describe energy transfers in electrical appliances 6.4 Use and rearrange E=Pt 6.5 Use and rearrange E=QV

6 6.2 Describe the difference between longitudinal and transverse waves giving examples for both 6.3 Describe amplitude, wavelength (λ), wave speed (v), frequency (f) and period of a wave (T) 6.6 Identify amplitude and wavelength from diagrams of a wave 2. Which of these examples are transverse waves and which are longitudinal waves? a. light waves, radio waves, heat b. sound waves, earthquake waves 3. Give the definition of each of the following key words: a. wavelength = b. wave speed = c. frequency = d. period = 4. Label the diagram with each of these key words: amplitude, wavelength. 7.2 Recall the order of electromagnetic waves and recall their frequency and wavelength and give examples of the uses of these Explain the difference between a permanent and induced magnet 5.3 Describe the force between a magnet and a magnetic material 5.4 Describe the direction and strength of a magnetic field around a magnet 5. Draw a poster to show the electromagnetic spectrum. It must include the names of each type of wave, a use of each type of wave, a danger of each type of wave and their frequency. 6. Complete the sentences by filling in the missing words: Permanent magnets produce their own Induced magnets become a magnet when placed in a. 11. Which of these is the only one which will repel a magnetic material? a. a magnet b. another magnetic material 12. Draw the magnetic field around the following magnet arrangements: a. North pole to North pole b. North pole to South pole c. South pole to South pole 20% 7.1 Describe what electromagnetic waves are 8.14 Recall the range of normal human hearing (triple 1. Give a definition for an electromagnetic wave. 2. What is the hearing range of a human (Hz)? 3. Name the four magnetic materials. 5.1 Describe the polarity of magnets and list 4 magnetic materials Key Terms Longitudinal Transverse Amplitude Frequency (f) Wavelength (λ) Period (T) Wave speed (v) Medium Normal Reflection Angle of incidence (θi) Angle of reflection (θr) Refraction Total Internal Reflection Critical Angle Refractive Index Frequency Range Electromagnetic Spectrum UV gamma (γ) Diffraction Digital Analogue Pitch

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